Styloclinesonorensis is known from southeastern Arizona and northeastern Sonora. A disjunct, 1930 California occurrence was from apparently suitable habitat; recent searches have not relocated it.

Styloclinesonorensis is illustrated in J. D. Morefield (1992). It is superficially similar to S. citroleum; its closest relative is S. micropoides. Its ancestors may have been hybrid products involving Logfiadepressa or its progenitors (Morefield).